In-situ synchrotron X-Ray diffraction investigation of the fast recovery of microstructure during electropulse treatment of heavily cold drawn nanocrystalline Ni-Ti wires

0365167 - FZÚ 2012 RIV CH eng J - Journal Article
Malard, B. - Pilch, Jan - Šittner, Petr - Delville, R. - Curfs, C.
In-situ synchrotron X-Ray diffraction investigation of the fast recovery of microstructure during electropulse treatment of heavily cold drawn nanocrystalline Ni-Ti wires.
Solid State Phenomena. 172-174, č. 6 (2011), s. 1243-1248. ISSN 1012-0394
R&D Projects: GA AV ČR(CZ) IAA200100627; GA MŠMT(CZ) LA10010
Institutional research plan: CEZ:AV0Z10100520
Keywords : recovery process * electropulse treatment * in-situ analysis * superelasticity
Subject RIV: BM - Solid Matter Physics ; Magnetism

Recovery processes responsible for evolution of microstructures in 0.1mm thin cold-drawn Ni-Ti shape memory alloy wire heat treated by DC electric pulse were investigated by combination of in-situ tensile stress - strain, electrical resistance and X-ray diffraction measurements. The X-ray data were used to obtain direct experimental information on the evolution of the phase fractions, internal strain and defects in the microstructure evolving through activation of a sequence of recovery processes during the short time electropulse treatment. It is shown that superelastic functional properties of the treated Ni-Ti wire can be precisely set by controlling the progress of the recovery processes by prescribing the time evolution of temperature T(t) and tensile stress s(t) (displacement control) in the treated wire.
Permanent Link: http://hdl.handle.net/11104/0200473